hixie: let's be precise here (whatwg r4921)
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.3941&r2=1.3942&f=hhttp://html5.org/tools/web-apps-tracker?from=4920&to=4921
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RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.3941
retrieving revision 1.3942
diff -u -d -r1.3941 -r1.3942
--- Overview.html 31 Mar 2010 19:41:12 -0000 1.3941
+++ Overview.html 31 Mar 2010 19:47:32 -0000 1.3942
@@ -21624,11 +21624,13 @@
current playback position.)</p>
<p class="note">The event thus is not to be fired faster than about
- 66Hz or slower than 4Hz. User agents are encouraged to vary the
+ 66Hz or slower than 4Hz (assuming the event handlers don't take
+ longer than 250ms to run). User agents are encouraged to vary the
frequency of the event based on the system load and the average
cost of processing the event each time, so that the UI updates are
not any more frequent than the user agent can comfortably handle
while decoding the video.</li>
+
<!--v2CUERANGE [beware - - nested comments]
<li><p>If none of the <span title="cue range">cue ranges</span> in
<var title="">current ranges</var> have their "active" boolean set